Okay, I know I've seen this post before, but for the life of me, I can't find it. I have a RB12 and I have a Speed Graphic with the 135 Optar. The only problem is that I don't see a mask listed for this particular lens/camera combination. The closest I can find is a mask that goes to 127mm. Which mask do I need for mine? Sorry for any duplication.

Unfortunately those charts don't include the mask numbers for 2-1/4" x 2-3/4" images. Could this information be added to that page? I have posted same on this board previously, as taken from an RH-20 Roll-Vance instruction booklet.